post: emit debug messages to the POST port#67
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dancrossnyc merged 1 commit intomainfrom Mar 10, 2026
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citrus-it
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Mar 8, 2026
We did this during initial development of phbl, but then backed it out because it didn't write to anything on gimlet (frankly, I had completely forgotten about removing it). But writes to port 80 _do_ go somewhere on Cosmo! So reintegrate it. We now emit two codes as matter of course during normal operation: (almost) immediately on entry to phbl (while we're still in real mode) and again immediately prior to jumping into the host OS. If `phbl` panics for any reason, it will emit a message prior to halting. Signed-off-by: Dan Cross <cross@oxidecomputer.com>
citrus-it
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Mar 9, 2026
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Tested on cosmo-os. The trampoline, which was the most invasive part of this change, works. |
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We did this during initial development of phbl, but then backed it out because it didn't write to anything on gimlet (frankly, I had completely forgotten about removing it). But writes to port 80 do go somewhere on Cosmo! So reintegrate it.
We now emit two codes as matter of course during normal operation: (almost) immediately on entry to phbl (while we're still in real mode) and again immediately prior to jumping into the host OS. If
phblpanics for any reason, it will emit a message prior to halting.